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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27178cd75d49f64d89d253d04bf70e7d75423dfe6cba2ab829813b9e96237db0' 
  AND token = 'ixz6B1LAmCeqO0y0yXyoq6mP+/7nFMil6dceCjPpZU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}